đã tạo được test case của createUser

vendor/php-webdriver/webdriver/lib/Exception/Internal/IOException.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+
+namespace Facebook\WebDriver\Exception\Internal;
+
+use Facebook\WebDriver\Exception\PhpWebDriverExceptionInterface;
+
+/**
+ * Exception class thrown when a filesystem related operation failure happens.
+ */
+class IOException extends \LogicException implements PhpWebDriverExceptionInterface
+{
+    public static function forFileError(string $message, string $path): self
+    {
+        return new self(sprintf($message . ' ("%s")', $path));
+    }
+}